Chemicals used for treatment of water intended for human consumption - Sulfuric acid

This document is applicable to sulfuric acid used for treatment of water intended for human consumption. It describes the characteristics of sulfuric acid and specifies the requirements and the corresponding test methods for sulfuric acid. It gives information on its use in water treatment.

Produkte zur Aufbereitung von Wasser für den menschlichen Gebrauch - Schwefelsäure

Dieses Dokument ist anzuwenden für Schwefelsäure zur Aufbereitung von Wasser für den menschlichen Gebrauch. Es beschreibt die Eigenschaften von Schwefelsäure und legt die Anforderungen sowie die entsprechenden Prüfverfahren für Schwefelsäure fest. Es enthält Angaben zu deren Anwendung in der Wasseraufbereitung.

Produits chimiques utilisés pour le traitement de l’eau destinée à la consommation humaine - Acide sulfurique

Le présent document s’applique à l’acide sulfurique utilisé pour le traitement de l’eau destinée à la consommation humaine. Il décrit les caractéristiques de l’acide sulfurique et spécifie les exigences et les méthodes d’essai correspondantes. Il donne des informations sur son emploi pour le traitement de l’eau.

Kemikalije, ki se uporabljajo za pripravo pitne vode - Žveplova kislina

Ta dokument obravnava žveplovo kislino, ki se uporablja za pripravo pitne vode. Opisuje lastnosti žveplove kisline ter določa zahteve in ustrezne preskusne metode zanjo. Podaja informacije za njeno uporabo pri pripravi vode.

General Information

Status
Published
Publication Date
29-Sep-2022
Withdrawal Date
30-Dec-2022
Current Stage
6060 - Definitive text made available (DAV) - Publishing
Start Date
01-Jun-2022
Due Date
04-Dec-2021
Completion Date
01-Jun-2022

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SLOVENSKI STANDARD
SIST EN 899:2022
01-julij-2022
Nadomešča:
SIST EN 899:2009
Kemikalije, ki se uporabljajo za pripravo pitne vode - Žveplova kislina

Chemicals used for treatment of water intended for human consumption - Sulfuric acid

Produkte zur Aufbereitung von Wasser für den menschlichen Gebrauch - Schwefelsäure

Produits chimiques utilisés pour le traitement de l’eau destinée à la consommation

humaine - Acide sulfurique
Ta slovenski standard je istoveten z: EN 899:2022
ICS:
13.060.20 Pitna voda Drinking water
71.100.80 Kemikalije za čiščenje vode Chemicals for purification of
water
SIST EN 899:2022 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
SIST EN 899:2022
---------------------- Page: 2 ----------------------
SIST EN 899:2022
EN 899
EUROPEAN STANDARD
NORME EUROPÉENNE
June 2022
EUROPÄISCHE NORM
ICS 71.100.80 Supersedes EN 899:2009
English Version
Chemicals used for treatment of water intended for human
consumption - Sulfuric acid

Produits chimiques utilisés pour le traitement de l'eau Produkte zur Aufbereitung von Wasser für den

destinée à la consommation humaine - Acide sulfurique menschlichen Gebrauch - Schwefelsäure

This European Standard was approved by CEN on 27 April 2022.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this

European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references

concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN

member.

This European Standard exists in three official versions (English, French, German). A version in any other language made by

translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management

Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,

Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,

Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and

United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels

© 2022 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 899:2022 E

worldwide for CEN national Members.
---------------------- Page: 3 ----------------------
SIST EN 899:2022
EN 899:2022 (E)
Contents Page

European foreword ...................................................................................................................................................... 3

Introduction .................................................................................................................................................................... 4

1 Scope .................................................................................................................................................................... 5

2 Normative references .................................................................................................................................... 5

3 Terms and definitions ................................................................................................................................... 5

4 Description ........................................................................................................................................................ 6

4.1 Identification .................................................................................................................................................... 6

4.2 Commercial forms .......................................................................................................................................... 6

4.3 Physical properties ........................................................................................................................................ 6

4.4 Chemical properties ....................................................................................................................................... 7

5 Purity criteria ................................................................................................................................................... 8

5.1 General................................................................................................................................................................ 8

5.2 Composition of commercial product ....................................................................................................... 8

5.3 Chemical parameters and indicator parameters ................................................................................ 8

6 Test methods .................................................................................................................................................... 9

6.1 Sampling ............................................................................................................................................................. 9

6.2 Analyses............................................................................................................................................................ 10

7 Labelling - Transportation - Storage ...................................................................................................... 13

7.1 Means of delivery .......................................................................................................................................... 13

7.2 Risk and safety labelling according to the EU Directives .............................................................. 14

7.3 Transportation regulations and labelling ........................................................................................... 15

7.4 Marking ............................................................................................................................................................ 16

7.5 Storage .............................................................................................................................................................. 16

Annex A (informative) General information on sulfuric acid .................................................................... 17

A.1 Origin ................................................................................................................................................................. 17

A.2 Use ...................................................................................................................................................................... 17

Annex B (normative) General rules relating to safety ................................................................................. 18

B.1 Rules for safe handling and use ............................................................................................................... 18

B.2 Emergency procedures ............................................................................................................................... 18

Bibliography ................................................................................................................................................................. 19

---------------------- Page: 4 ----------------------
SIST EN 899:2022
EN 899:2022 (E)
European foreword

This document (EN 899:2022) has been prepared by Technical Committee CEN/TC 164 “Water supply”,

the secretariat of which is held by AFNOR.

This European Standard shall be given the status of a national standard, either by publication of an

identical text or by endorsement, at the latest by December 2022, and conflicting national standards

shall be withdrawn at the latest by December 2022.

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. CEN shall not be held responsible for identifying any or all such patent rights.

This document supersedes EN 899:2009.

In comparison with the previous edition, the following technical modifications have been made:

a) modification of 7.3 on transportation regulations and labelling, adding the sentence “The user shall

be aware of the incompatibilities between transported products.”;

b) modification of 7.4 on marking. The requirements of marking are also applied to the accompanying

documents;
c) use of the changed classification and labelling (see [4]);

d) deletion of the reference to EU Directive 67/548/EEC of June 27, 1967 in order to take into account

the latest Directive in force (see [4]).

Any feedback and questions on this document should be directed to the users’ national standards body.

A complete listing of these bodies can be found on the CEN website.

According to the CEN-CENELEC Internal Regulations, the national standards organisations of the

following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,

Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland,

Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of

North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the

United Kingdom.
---------------------- Page: 5 ----------------------
SIST EN 899:2022
EN 899:2022 (E)
Introduction

In respect of potential adverse effects on the quality of water intended for human consumption, caused

by the product covered by this document:

a) this document provides no information as to whether the product may be used without restriction

in any of Member States of the EU or EFTA;

b) it should be noted that, while awaiting the adoption of verifiable European criteria, existing national

regulations concerning the use and/or the characteristics of this product remain in force.

NOTE Conformity with this document does not confer or imply acceptance or approval of the product in any

of the Member States of the EU or EFTA. The use of the product covered by this document is subject to regulation

or control by National Authorities (see Annex A).
---------------------- Page: 6 ----------------------
SIST EN 899:2022
EN 899:2022 (E)
1 Scope

This document is applicable to sulfuric acid used for treatment of water intended for human

consumption. It describes the characteristics of sulfuric acid and specifies the requirements and the

corresponding test methods for sulfuric acid. It gives information on its use in water treatment.

2 Normative references

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements of this document. For dated references, only the edition cited applies. For

undated references, the latest edition of the referenced document (including any amendments) applies.

EN ISO 12846, Water quality - Determination of mercury - Method using atomic absorption spectrometry

(AAS) with and without enrichment (ISO 12846)

ISO 17378-2, Water quality — Determination of arsenic and antimony — Part 2: Method using hydride

generation atomic absorption spectrometry (HG-AAS)

EN ISO 3696, Water for analytical laboratory use - Specification and test methods (ISO 3696)

EN ISO 11885, Water quality - Determination of selected elements by inductively coupled plasma optical

emission spectrometry (ICP-OES) (ISO 11885)

ISO 910, Sulphuric acid and oleum for industrial use — Determination of total acidity, and calculation of

free sulphur trioxide content of oleum — Titrimetric method

ISO 3423, Sulphuric acid and oleums for industrial use — Determination of sulphur dioxide content —

Iodometric method

ISO 6332, Water quality — Determination of iron — Spectrometric method using 1,10-phenanthroline

ISO 8288:1986, Water quality — Determination of cobalt, nickel, copper, zinc, cadmium and lead —

Flame atomic absorption spectrometric methods

ISO 9174, Water quality — Determination of chromium — Atomic absorption spectrometric methods

ISO/TS 17379-2, Water quality — Determination of selenium — Part 2: Method using hydride generation

atomic absorption spectrometry (HG-AAS)
3 Terms and definitions
No terms and definitions are listed in this document.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— ISO Online browsing platform: available at https://www.iso.org/obp/ui
— IEC Electropedia: available at https://www.electropedia.org/
---------------------- Page: 7 ----------------------
SIST EN 899:2022
EN 899:2022 (E)
4 Description
4.1 Identification
4.1.1 Chemical name
Sulfuric acid.
4.1.2 Synonym or common name
Oil of vitriol.
4.1.3 Relative molecular mass
98.
4.1.4 Empirical formula
H SO .
2 4
4.1.5 Chemical formula
H SO .
2 4
4.1.6 CAS Registry Number
7664-93-9.
4.1.7 EINECS reference
231-639-5.
4.2 Commercial forms
Sulfuric acid is available as aqueous solutions.
NOTE For some water treatment applications, diluted acid can be used.
4.3 Physical properties
4.3.1 Appearance
The product is a clear or slightly turbid, colourless liquid.
4.3.2 Density
1,84 g/ml for sulfuric acid concentration of mass fraction of 96 % at 20 °C.
1,71 g/ml for sulfuric acid concentration of mass fraction of 78 % at 20 °C.
1,18 g/ml for sulfuric acid concentration of mass fraction of 25 % at 20 °C.
4.3.3 Solubility in water
At all concentrations, the product is miscible with water.
Chemical Abstracts Service Registry Number.
European Inventory of Existing Commercial Chemical Substances.
---------------------- Page: 8 ----------------------
SIST EN 899:2022
EN 899:2022 (E)
4.3.4 Vapour pressure

Below 0,000 01 kPa for sulfuric acid concentration of mass fraction of 96 % at 20 °C.

Below 0,1 kPa for sulfuric acid concentration of mass fraction of 78 % at 20 °C.
Below 1,9 kPa for sulfuric acid concentration of mass fraction of 25 % at 20 °C.
4.3.5 Boiling point at 100 kPa
NOTE 100 kPa = 1 bar.
+310 °C for sulfuric acid concentration of mass fraction of 96 %.
Approximately + 200 °C for sulfuric acid concentration of mass fraction of 78 %.
+106,5 °C for sulfuric acid concentration of mass fraction of 25 %.
4.3.6 Melting point
+5 °C for sulfuric acid concentration of mass fraction of 98 %.
−10 °C for sulfuric acid concentration of mass fraction of 96 %.
−11 °C for sulfuric acid concentration of mass fraction of 78 %.
−22 °C for sulfuric acid concentration of mass fraction of 25 %.
4.3.7 Specific heat

1,465 kJ/(kg.K) for sulfuric acid concentration of mass fraction of 96 % at 20 °C.

4.3.8 Viscosity (dynamic)
22 mPa·s for sulfuric acid concentration of mass fraction of 96 % at 20 °C.
16,7 mPa·s for sulfuric acid concentration of mass fraction of 78 % at 20 °C.
4.3.9 Critical temperature
Not applicable.
4.3.10 Critical pressure
Not applicable.
4.3.11 Physical hardness
Not applicable.
4.4 Chemical properties
Concentrated sulfuric acid reacts violently:
— with bases or with water (exothermic reaction);
— with reducing agents due to oxidizing properties;
— with combustible materials due to oxidizing and dehydrating properties.

The concentrated acid is a strong oxidizing agent and can cause ignition in contact with organic

materials.
---------------------- Page: 9 ----------------------
SIST EN 899:2022
EN 899:2022 (E)

Sulfuric acid (of sulfuric acid content less than a mass fraction of 70 % attacks most common metals,

e.g. iron, zinc, liberating the flammable gas hydrogen.

WARNING — Mixing with water produces a marked temperature rise. Therefore, ALWAYS ADD THE

ACID TO THE WATER (NEVER THE REVERSE), slowly and agitating continuously.
5 Purity criteria
5.1 General

This document specifies the minimum purity requirements for sulfuric acid used for the treatment of

water intended for human consumption. Limits are given for impurities commonly present in the

product. Depending on the raw material and the manufacturing process other impurities can be present

and, if so, this shall be notified to the user and, when necessary, to the relevant authorities.

Users of this product should check the national regulations in order to clarify whether it is of

appropriate purity for treatment of water intended for human consumption, taking into account raw

water quality, contents of other impurities and additives used in the products not stated in the product

standard.

Limits have been given for impurities and chemicals parameters where these are likely to be present in

significant quantities from the current production process and raw materials. If the production process

or raw materials lead to significant quantities of impurities, by-products or additives being present, this

shall be notified to the user.
5.2 Composition of commercial product
The usual commercial concentrations of sulfuric aci
...

SLOVENSKI STANDARD
oSIST prEN 899:2020
01-september-2020
Kemikalije, ki se uporabljajo za pripravo pitne vode - Žveplova kislina

Chemicals used for treatment of water intended for human consumption - Sulfuric acid

Produkte zur Aufbereitung von Wasser für den menschlichen Gebrauch - Schwefelsäure

Produits chimiques utilisés pour le traitement de l’eau destinée à la consommation

humaine - Acide sulfurique
Ta slovenski standard je istoveten z: prEN 899
ICS:
13.060.20 Pitna voda Drinking water
71.100.80 Kemikalije za čiščenje vode Chemicals for purification of
water
oSIST prEN 899:2020 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
oSIST prEN 899:2020
---------------------- Page: 2 ----------------------
oSIST prEN 899:2020
DRAFT
EUROPEAN STANDARD
prEN 899
NORME EUROPÉENNE
EUROPÄISCHE NORM
June 2020
ICS 71.100.80 Will supersede EN 899:2009
English Version
Chemicals used for treatment of water intended for human
consumption - Sulfuric acid

Produits chimiques utilisés pour le traitement de l'eau Produkte zur Aufbereitung von Wasser für den

destinée à la consommation humaine - Acide sulfurique menschlichen Gebrauch - Schwefelsäure

This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee

CEN/TC 164.

If this draft becomes a European Standard, CEN members are bound to comply with the CEN/CENELEC Internal Regulations

which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.

This draft European Standard was established by CEN in three official versions (English, French, German). A version in any other

language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC

Management Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,

Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,

Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and

United Kingdom.

Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are

aware and to provide supporting documentation.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without

notice and shall not be referred to as a European Standard.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels

© 2020 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 899:2020 E

worldwide for CEN national Members.
---------------------- Page: 3 ----------------------
oSIST prEN 899:2020
prEN 899:2020 (E)
Contents Page

European foreword ...................................................................................................................................................... 3

Introduction .................................................................................................................................................................... 4

1 Scope .................................................................................................................................................................... 5

2 Normative references .................................................................................................................................... 5

3 Terms and definitions ................................................................................................................................... 5

4 Description ........................................................................................................................................................ 6

4.1 Identification .................................................................................................................................................... 6

4.2 Commercial forms .......................................................................................................................................... 6

4.3 Physical properties ........................................................................................................................................ 6

4.4 Chemical properties ....................................................................................................................................... 7

5 Purity criteria ................................................................................................................................................... 8

5.1 General................................................................................................................................................................ 8

5.2 Composition of commercial product ....................................................................................................... 8

5.3 Chemical parameters and indicator parameters ................................................................................ 8

6 Test methods .................................................................................................................................................... 9

6.1 Sampling ............................................................................................................................................................. 9

6.2 Analyses............................................................................................................................................................ 10

7 Labelling - Transportation - Storage ...................................................................................................... 13

7.1 Means of delivery .......................................................................................................................................... 13

7.2 Risk and safety labelling according to the EU Directives .............................................................. 14

7.3 Transportation regulations and labelling ........................................................................................... 14

7.4 Marking ............................................................................................................................................................ 15

7.5 Storage .............................................................................................................................................................. 15

Annex A (informative) General information on sulfuric acid .................................................................... 16

A.1 Origin ................................................................................................................................................................. 16

A.2 Use ...................................................................................................................................................................... 16

Annex B (normative) General rules relating to safety .................................................................................. 17

B.1 Rules for safe handling and use ............................................................................................................... 17

B.2 Emergency procedures ............................................................................................................................... 17

Bibliography ................................................................................................................................................................. 18

---------------------- Page: 4 ----------------------
oSIST prEN 899:2020
prEN 899:2020 (E)
European foreword

This document (prEN 899:2020) has been prepared by Technical Committee CEN/TC 164 “Water

supply”, the secretariat of which is held by AFNOR.
This document is currently submitted to the CEN Enquiry.
This document will supersede EN 899:2009.

In comparison with the previous edition, the following technical modifications have been made:

a) modification of 7.3 on transportation regulations and labelling, adding the sentence “The user shall

be aware of the incompatibilities between transported products.”;

b) modification of 7.4 on marking. The requirements of marking are also applied to the accompanying

documents;
c) use of the changed classification and labelling (see [4]);

d) deletion of the reference to EU Directive 67/548/EEC of June 27, 1967 in order to take into account

the latest Directive in force (see [4]).
---------------------- Page: 5 ----------------------
oSIST prEN 899:2020
prEN 899:2020 (E)
Introduction

In respect of potential adverse effects on the quality of water intended for human consumption, caused

by the product covered by this document:

a) this document provides no information as to whether the product may be used without restriction

in any of Member States of the EU or EFTA;

b) it should be noted that, while awaiting the adoption of verifiable European criteria, existing national

regulations concerning the use and/or the characteristics of this product remain in force.

NOTE Conformity with the standard does not confer or imply acceptance or approval of the product in any of

the Member States of the EU or EFTA. The use of the product covered by this document is subject to regulation or

control by National Authorities.
---------------------- Page: 6 ----------------------
oSIST prEN 899:2020
prEN 899:2020 (E)
1 Scope

This document is applicable to sulfuric acid used for treatment of water intended for human

consumption. It describes the characteristics of sulfuric acid and specifies the requirements and the

corresponding test methods for sulfuric acid. It gives information on its use in water treatment.

2 Normative references

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements of this document. For dated references, only the edition cited applies. For

undated references, the latest edition of the referenced document (including any amendments) applies.

EN ISO 12846, Water quality — Determination of mercury — Method using atomic absorption

spectrometry (AAS) with and without enrichment (ISO 12846)

EN 26595, Water quality — Determination of total arsenic — Silver diethyldithiocarbamate

spectrophotometric method (ISO 6595)

EN ISO 3696, Water for analytical laboratory use — Specification and test methods (ISO 3696)

EN ISO 11885, Water quality — Determination of selected elements by inductively coupled plasma optical

emission spectrometry (ICP-OES) (ISO 11885)

ISO 910, Sulphuric acid and oleum for industrial use — Determination of total acidity, and calculation of

free sulphur trioxide content of oleum — Titrimetric method

ISO 3423, Sulphuric acid and oleums for industrial use — Determination of sulphur dioxide content —

Iodometric method

ISO 6332, Water quality — Determination of iron — Spectrometric method using 1,10-phenanthroline

ISO 8288, Water quality — Determination of cobalt, nickel, copper, zinc, cadmium and lead — Flame

atomic absorption spectrometric methods

ISO 9174, Water quality – Determination of chromium – Atomic absorption spectrometric methods

ISO/TS 17379-2, Water quality — Determination of selenium — Part 2: Method using hydride generation

atomic absorption spectrometry (HG-AAS)
3 Terms and definitions
No terms and definitions are listed in this document.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

• ISO Online browsing platform: available at https://www.iso.org/obp/ui
• IEC Electropedia: available at http://www.electropedia.org/
---------------------- Page: 7 ----------------------
oSIST prEN 899:2020
prEN 899:2020 (E)
4 Description
4.1 Identification
4.1.1 Chemical name
Sulfuric acid.
4.1.2 Synonym or common name
Oil of vitriol.
4.1.3 Relative molecular mass
98.
4.1.4 Empirical formula
H2SO4.
4.1.5 Chemical formula
H SO .
2 4
4.1.6 CAS Registry Number
7664-93-9.
4.1.7 EINECS reference
231-639-5.
4.2 Commercial forms
Sulfuric acid is available as aqueous solutions.
NOTE For some water treatment applications, diluted acid can be used.
4.3 Physical properties
4.3.1 Appearance
The product is a clear or slightly turbid, colourless liquid.
4.3.2 Density
1,84 g/ml for sulfuric acid concentration of mass fraction of 96 % at 20 °C.
1,71 g/ml for sulfuric acid concentration of mass fraction of 78 % at 20 °C.
1,18 g/ml for sulfuric acid concentration of mass fraction of 25 % at 20 °C.
4.3.3 Solubility in water
At all concentrations, the product is miscible with water.
Chemical Abstracts Service Registry Number.
European Inventory of Existing Commercial Chemical Substances.
---------------------- Page: 8 ----------------------
oSIST prEN 899:2020
prEN 899:2020 (E)
4.3.4 Vapour pressure

Below 0,00001 kPa for sulfuric acid concentration of mass fraction of 96 % at 20 °C.

Below 0,1 kPa for sulfuric acid concentration of mass fraction of 78 % at 20 °C.
Below 1,9 kPa for sulfuric acid concentration of mass fraction of 25 % at 20 °C.
4.3.5 Boiling point at 100 kPa
NOTE 100 kPa = 1 bar.
+ 310 °C for sulfuric acid concentration of mass fraction of 96 %.
Approximately + 200 °C for sulfuric acid concentration of mass fraction of 78 %.
+ 106,5 °C for sulfuric acid concentration of mass fraction of 25 %.
4.3.6 Melting point
+ 5 °C for sulfuric acid concentration of mass fraction of 98 %.
- 10 °C for sulfuric acid concentration of mass fraction of 96 %.
- 11 °C for sulfuric acid concentration of mass fraction of 78 %.
- 22 °C for sulfuric acid concentration of mass fraction of 25 %.
4.3.7 Specific heat

1,465 kJ/(kg.K) for sulfuric acid concentration of mass fraction of 96 % at 20 °C.

4.3.8 Viscosity (dynamic)
22 mPa.s for sulfuric acid concentration of mass fraction of 96 % at 20 °C.
16,7 mPa.s for sulfuric acid concentration of mass fraction of 78 % at 20 °C.
4.3.9 Critical temperature
Not applicable.
4.3.10 Critical pressure
Not applicable.
4.3.11 Physical hardness
Not applicable.
4.4 Chemical properties
Concentrated sulfuric acid reacts violently:
— with bases or with water (exothermic reaction);
— with reducing agents due to oxidizing properties;
— with combustible materials due to oxidizing and dehydrating properties.

The concentrated acid is a strong oxidizing agent and can cause ignition in contact with organic

materials.

Sulfuric acid (of sulfuric acid content less than a mass fraction of 70 % attacks most common metals,

e.g. iron, zinc, liberating the flammable gas hydrogen.
---------------------- Page: 9 ----------------------
oSIST prEN 899:2020
prEN 899:2020 (E)

WARNING — Mixing with water produces a marked temperature rise. Therefore, ALWAYS ADD THE

ACID TO THE WATER (NEVER THE REVERSE), slowly and agitating continuously.
5 Purity criteria
5.1 General

This document specifies the minimum purity requirements for sulfuric acid used for the treatment of

water intended for human consumption. Limits are given for impurities commonly present in the

product. Depending on the raw material and the manufacturing process other impurities can be present

and, if so, this shall be notified to the user and, when necessary, to the relevant authorities.

Users of this product should check the national regulations in order to clarify whether it is of

appropriate purity for treatment of water intended for human consumption, taking into account raw

water quality, contents of other impurities and additives used in the products not stated in the product

standard.

Limits have been given for impurities and chemicals parameters where these are likely to be present in

significant quantities from the current production process and raw materials. If the production process

or raw materials lead to significant quantities of impurities, by-products or additives being present, this

shall be notified to the user.
5.2 Composition of commercial product

The usual commercial concentrations of sulfuric acid available have a mass fraction of 96 % or 98 %.

Other concentrations of sulfuric acid between a mass fraction of 25 % and
...

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